Most of the people discussing here have agreed that women weren't as good warriors as men (except our dear Éowyn, who, btw, in my opinion didn't have proper warrior-training. She just had the "defensive-warrior"-training). Women can't be called as "kings" (except the swedish Christina-case, but oh, swedish people are strange in other ways too
, so probably that doesn't count) since they're women. But what about a woman sorceror? Surely there could be one. (And don't say she would be called "a sorceress", because if there's both men and women they're usually called by the male title only.)